Windows Nashville (1995) 8 Windows

Windows Nashville is a cancelled Windows 9x release scheduled between Windows 95 and 98. It is also known as Windows 96.

• Build 999

Windows Neptune (1999) 15 Windows

Windows Neptune was a canceled version of Windows 2000 oriented towards the home market. It had featured elements brought over from Windows ME as well as new concepts such as activity centers. No final release of Neptune shipped and most work was rolled into Whistler

• Build 5111

Windows NT 3.x (1991) 207 Windows

Windows NT 3.1 was the first of the Windows NT series. Sporting the same face as its consumer counterpart Windows 3.1, it was completely different under the hood. A true 32-bit native operating system, Windows NT descended from the work Microsoft did while collaborating with IBM on OS/2 after the great split, and bringing in former DEC employees like Dave Cutler, bringing a VMS influence into the system. It was followed up by Windows NT 4.0. | 1.0 | 2.x | 3.x | NT 3.x | 95 | NT 4.0 | 98 | 2000 | ME | All |

• NT 3.1 Pre-Release
• 3.1
• 3.5
• 3.51
• Patches

Windows NT 4.0 (1995) 316 Windows

Windows NT 4.0 is the successor to the Windows NT 3.x release. In this release, the user interface from Windows 95 was integrated, making NT just as easy to use as its consumer counterpart. Internet Explorer was bundled, providing a web browser out of the box. Speed was improved by moving components into kernel-mode, at the expense of security and reliability - changes Windows is suffering from today, and is being reverted. NT 4 was followed up by Windows 2000. | 1.0 | 2.x | 3.x | NT 3.x | 95 | NT 4.0 | 98 | 2000 | ME | All |

• Cairo/Hydra
• 4.0
• Patches